Abstract: At present, domestic large-scale H-class peak shaving gas turbine power stations are generally equipped with generator circuit breaker（GCB）. Based on relevant standards and actual operation requirements, this paper analyzes and studies the GCB setting mode of gas turbine power station, puts forward an optimized design scheme for the main single line diagram of large-scale H-class peak shaving gas turbine, and demonstrates the technical feasibility and economy of this scheme through technical and economic analysis.